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Polarization imager based on triple photoelastic modulator

A polarization imaging and modulator technology, applied in polarization spectrum, optics, instruments, etc., can solve the problems of difficulty in obtaining polarization information and high modulation frequency, and achieve the effect of reducing the difficulty of image fusion, large luminous flux, and good stability

Inactive Publication Date: 2015-10-28
ZHONGBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the high modulation frequency of PEM (tens to hundreds of kHz), it is difficult to obtain polarization information by using CCD

Method used

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  • Polarization imager based on triple photoelastic modulator
  • Polarization imager based on triple photoelastic modulator
  • Polarization imager based on triple photoelastic modulator

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Embodiment Construction

[0028] The following describes the detailed technical solution of the present invention in conjunction with the accompanying drawings. This embodiment is only an example, and the technology of the invention is not limited to this embodiment.

[0029] Such as Figure 1-6 As shown, the polarization imager based on three photoelastic modulators includes a pre-collecting mirror group, a three-PEM difference frequency modulation system, an imaging mirror group, a CCD, a lock-in amplifier and a control module, wherein the pre-collecting mirror group includes a thin Lens 5, doublet lens 6, relay relay mirror group 7, meniscus lens 8 and doublet mirror 9, relay relay mirror group includes thin lens, concave lens, diaphragm and plano-convex mirror, relay relay mirror The group is placed on the image plane of the mirror group composed of thin lenses and doublet lenses, which performs image rotation and compresses the beam diameter of the collected beam; the three-PEM difference frequenc...

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Abstract

The invention discloses a polarization imager based on a triple photoelastic modulator. The polarization imager comprises a prepositioned collecting mirror group, a triple-PEM difference frequency modulation system, an imaging mirror group, a CCD, a lock-in amplifier, and a control module. Incident light from a target forms a parallel collimated light beam after passing the collecting mirror group, is subjected to polarization modulation by the triple-PEM difference frequency modulation system, and generates a low-frequency modulation component carrying measured polarization information. The low-frequency modulation component passes the corresponding lock-in amplifier and is subjected to polarization imaging by the imaging mirror group. The polarization imager structure and method based on the triple photoelastic modulator have advantages of fast imaging speed, high polarization measurement precision, and large luminous flux and can be used for polarization imaging detection of fast-changed or mobile targets.

Description

technical field [0001] The invention relates to a polarization imager, specifically a polarization imager based on a three-photoelastic modulator that uses an afocal light collection system combined with a three-photoelastic modulator difference frequency modulation technology and a phase-locked amplifier to realize frame-style photography . Background technique [0002] Polarization imagers can integrate target spatial information and polarization information, increase the amount of information in optical detection, and improve the ability to detect and identify targets. application value. For it, the accuracy of polarization measurement will have a direct impact on the detection contrast, the effect of scattering elimination, and the extraction of target feature information. Taking the measurement of atmospheric particulate matter as an example, the article First results from a dual photoelastic-modulator-based polarimetric camera published by David J. Diner et al. on AP...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/447G02B27/28
Inventor 李晓陈友华陈媛媛李晋华李克武李永帅
Owner ZHONGBEI UNIV
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